Theming bonus with Oxford University

Please let me know what I'm doing wrong, because I can't seem to get a theming bonus for my two works of writing for Oxford University.

I tried two writings (that I own) from the Industrial period, and then another two writings from the Renaissance period (one that I swapped with the Ottomans to achieve).

Any insight to this is greatly appreciated.

Did you make sure they were both from the different civs? Sometimes swapping can get a bit confusing if you don't make sure you know what you're swapping.

You can't use your own works. Also, the works have to be from different civs and different eras. If you put your cursor over the theming bonus place it should tell you this.

Ahhhhh yes! Relief like a really bad itch! That was it, thank you very much!